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FQ WASHBoURNa 0F N-EW YORK.v N.l Y. I Letters Patent No. 72,766, elated December 31, 1867.

IMPROVEMENT IN BOLTS POR SAW-FRAMES, 6to.

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To ALL WHoM rr MAY GONOERN:

Beit known that I, F. WASIIBORNE, ofv 62 lReade street, NewYork, in the county of NewYork, and in the State of New York, have invented a new and usei'ul Improvement in Bolts forSaw-Frtmes and other purpeses;' and I do herebydeclarethat `the following is a full, clear, `and exact description thereof, which willV -enable those skilled in the art to make and use the same, reference being hadk to the accompanying drawing,

forming part of this specification, in which drawing v u Figure l represents a screw-bolt or fastening made according to my invention, thehed being iu section; Figure 2 shows a portion of a sawsframe and a top View of its fastoningsscrcwbolts. Y Similar letters indicate corresponding parts. v v i. This invention relates to tle making of screwbolts,'such, for example, as aroused for attaching the blade of a saw to its frame or handle.A Such bolts have liithertoibeen-made ofnone pieceoi`V metal, the ordinary mode of making the'm being to east them, the head and shank being. 'made-in one piecei l` I n the case of thosewhich are used for uniting ,the blades of hand-saws to 'their frames or handles, the' material employed is brass, which helps to give a handsome finish to the handle. Among other disadvantages or defects of screw-bolts when thus made is their britt-le character, their coarse and rough appearance, the.A large percentage of material which is wasted in'the manufacture, and their large oost. v 4

t In producing screw-boltsv for saw-frames or handles, or other purposes,"aecording'.to my invention, I make use of wrought metal only, (save for the nut,)and form thehead and the shank entirely separate and apart from each other. In screw-bolts for saw-frames, I take sheet brass, and'cnt out the heads by means ofpunches or other suitable'implements, and afterwards strike or swage them up to the ferm required means of dies. 'I n fig. 1,1 have shown such a head, A, with a concavity formed on` its upper surface by'lmeansof suitable dies. The upper surface of the head is, if desired, impressed, from the face of the die, with a'tradc-mark, or with the name of the maker, or with ornamental characters. The shank or body, B', is made' of wrought' wire, of the proper diameter, which is cut oil` to the proper length, and oneend, after being made square, is united to. the under 'surface of the head -A by brazing o r soldering at C, after which a screw-threadis formed'on' the other end of thc'shank. l l y When .tlie'serew-bolt is ready for use, the shank Bis put through the frame-or handle and saw-blade, and the end of the shank is secured by the nut D, in the usual manner. f p l t Any kind of wrought metalvcan be employed, but in case of artielesthat'require considerable finish, wrought brass is preferable, on account of its ornamental'appearanee. l I l Among other advantages obtained by my improvement is, that It am enabled to use wrought metal, produciug thereby an article superior on account 'of its toughness and strength, and-capable of more wear, than one made of cast metal, and less liableto break under great strain. Another is, that an ornamental character, or a name, or a trade-mark, can be impressed on the head inthe operation of swaging or striking it upto the form required. Another advantage is, that the article can be made at avrcdueed cost compared withthe cast bolt. I v

` What I-claim as new, and desire te secure by Letters Patent, is

As a new article of manufacture, a headedjbolt, made, as above described, of wrought metal, the head and shank being made in separate pieces, and afterwards b'razed or soldered to each other, as specied.

' F. WASHBOURNE. Witnesses:

W. HAUrr, GUsrAv Bane. 

